Thanks for the confirmation. I also bought a Conbee2 and tested and it worked perfectly for me as well. I reached out to the devs on Discord and we went through a ton of tests and updates to the Nortek stick. I don’t have the right terminology but essentially it is a limitation of that stick and isn’t likely to ever work reliably with the Lutron dimmer. I’m still deciding if migrating 70+ devices to my Conbee stick just to get these puppies working is worth it. The amount of downtime needed will likely cause an uprising by my family. 
Some details can be found at my post here: